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Add verilog backend option for simple_lhs

This commit is contained in:
Miodrag Milanovic 2020-11-25 18:21:41 +01:00
parent addc493e8d
commit 7b093dca10
1 changed files with 22 additions and 6 deletions
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28
backends/verilog/verilog_backend.cc
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@ -35,7 +35,7 @@
USING_YOSYS_NAMESPACE USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN PRIVATE_NAMESPACE_BEGIN
bool verbose, norename, noattr, attr2comment, noexpr, nodec, nohex, nostr, extmem, defparam, decimal, siminit, systemverilog; bool verbose, norename, noattr, attr2comment, noexpr, nodec, nohex, nostr, extmem, defparam, decimal, siminit, systemverilog, simple_lhs;
int auto_name_counter, auto_name_offset, auto_name_digits, extmem_counter; int auto_name_counter, auto_name_offset, auto_name_digits, extmem_counter;
std::map<RTLIL::IdString, int> auto_name_map; std::map<RTLIL::IdString, int> auto_name_map;
std::set<RTLIL::IdString> reg_wires; std::set<RTLIL::IdString> reg_wires;
@ -1546,14 +1546,22 @@ void dump_cell(std::ostream &f, std::string indent, RTLIL::Cell *cell)
void dump_conn(std::ostream &f, std::string indent, const RTLIL::SigSpec &left, const RTLIL::SigSpec &right) void dump_conn(std::ostream &f, std::string indent, const RTLIL::SigSpec &left, const RTLIL::SigSpec &right)
{ {
int offset = 0; if (simple_lhs) {
for (auto &chunk : left.chunks()) { int offset = 0;
for (auto &chunk : left.chunks()) {
f << stringf("%s" "assign ", indent.c_str());
dump_sigspec(f, chunk);
f << stringf(" = ");
dump_sigspec(f, right.extract(offset, GetSize(chunk)));
f << stringf(";\n");
offset += GetSize(chunk);
}
} else {
f << stringf("%s" "assign ", indent.c_str()); f << stringf("%s" "assign ", indent.c_str());
dump_sigspec(f, chunk); dump_sigspec(f, left);
f << stringf(" = "); f << stringf(" = ");
dump_sigspec(f, right.extract(offset, GetSize(chunk))); dump_sigspec(f, right);
f << stringf(";\n"); f << stringf(";\n");
offset += GetSize(chunk);
} }
} }
@ -1865,6 +1873,9 @@ struct VerilogBackend : public Backend {
log(" deactivates this feature and instead will write string constants\n"); log(" deactivates this feature and instead will write string constants\n");
log(" as binary numbers.\n"); log(" as binary numbers.\n");
log("\n"); log("\n");
log(" -simple-lhs\n");
log(" Connection assignments with simple left hand side without concatenations.\n");
log("\n");
log(" -extmem\n"); log(" -extmem\n");
log(" instead of initializing memories using assignments to individual\n"); log(" instead of initializing memories using assignments to individual\n");
log(" elements, use the '$readmemh' function to read initialization data\n"); log(" elements, use the '$readmemh' function to read initialization data\n");
@ -1912,6 +1923,7 @@ struct VerilogBackend : public Backend {
defparam = false; defparam = false;
decimal = false; decimal = false;
siminit = false; siminit = false;
simple_lhs = false;
auto_prefix = ""; auto_prefix = "";
bool blackboxes = false; bool blackboxes = false;
@ -1984,6 +1996,10 @@ struct VerilogBackend : public Backend {
selected = true; selected = true;
continue; continue;
} }
if (arg == "-simple-lhs") {
simple_lhs = true;
continue;
}
if (arg == "-v") { if (arg == "-v") {
verbose = true; verbose = true;
continue; continue;